Crank turner



F. B. COCKBURN AND E. Elim.

l GRANK TURNER. APPLlcATxoN FILED FEB.8.1919.

F. B. COCKBURN AND E. S. BIRD.

CRANK TURNER.'

APPLICATION FILED FEB.8|19I9.

' )I 355,63 l Patented Nov. M, 19221.

Patnted Nov. M, 1922.

8 SHEETS-SHEET 3. N/7

F. B. cocKuRN AND Lis. Blau.

CRANK TURNER. APPLICATION FILEDFEBJ a. 1919.

F. B. coCKBunN AND E. s. BIRD.

Llo

l f if CRANK uRNER.

APPLICATION FILED FEB. 8, |919.

Patented Nov. M, 192i 8l SHEETS-SHEE'I 4.

affiora/ey@ F.4B. COCKBURN AND E. S. BIRD. CRANK TURNER.

APPLICATION FILED FEB. 8, 1919.

1,435,63 l Patented Nov. M., R922.

8 SHEETS-SHEET 5.

`I. B. CIOCKBURN AND E..s. BIRDI CRANK TURNER. APPLICATION FILED FEB. e. I9I9.

Patented Nov. Mi, 11922,

B SHEETS-SHEET 6 ALSSL d minimum IIUHIIIII \Il II FrB. COCKBURN AND E. S. BIRD.

CRANK TURNER.

APPLICATION FILED FEB. 8. 1919.

I'Agl Patented Nov. M, 1922.

M am W F B. COCKBURN AND E. S. BIRD.

CRANK TURNER. APPLICATION FILED FEB.8,1919.

Patented Nov. M, i922.

Www/f Patented Nov. f4, 13.922.

NETE@ acatar' carena seance.

FRANCIS B. COCKBURN AND EDWARD S. BIRD, OF CINCINNATI, OHIO, ASSIGNORS TO THE LODGE & SHIPLEY MACHINE TOOL COMPANY, OF CINCINNATI, OHIO, A CORIEO-A RATION 0F OHIO.

CRANE TURNER.

Application led February 8, 1919. Serial No. 275,843.

To @ZZ who m tmey conce/'n Be it known that we, FRANCIS B. COOK- BURN and EDWARD S. Bum, sub'ects of- (reat Britain, and residing at Cincinnati, in the county of Hamilton Aand State of Ohio, have invented a new and useful Improvement in Crank Turners, of which the following specification is a full disclosure.

Our invention relates to a machine tool for turning crank shafts and more particularly it relates to a machine tool adapted for turning the crankpins thereof, which, in general practise, is a second step in the machining of a crank shaft subsequent to a first step of turning the center bearings and shaft ends in the standard type of lathe.

The object ofthe invention deals with the chucking of the Work in various positions to center the crank pins to be turned, coincident to the axis of chuck rotation'.

A further object is to provide a means for circumferentially clamping a bearing portion of the shaft and adjusting said means radially relative t0 the axis of chuck rotation to center a crank pin coincident to the axis of chuck rotation.

A further object is to provide an interchangeable gauge definitely determining the degree of radial adjustment.

Another object is to provide an extension chuck or adapter cooperating with the main chuck to extend the reach thereof.

A further object is to provide centering devic s associated with the chucks adapted to e gage a turned crank pin to radially position a crank pin to be turned coincident to the axis of. chuck rotation.

A further object is to provide a rotatable chuck body having a throw-block clampingly engaging a bearing portion of a crank shaft and radiallv adjustable to position .said shaft eccentric to the axis of chuck tion and economic manufacture, will be fully understood by reference to the following and in section, of the right and left hand head-stocks and a portion of the lathe bed, showing the connecting spindle drive.

Fig. 2 is a side elevation of the chuck mechanism and a portion of Veach headstock, showing a six-throw crank shaft with center bearings, chucked by turning the two outer crank pins.

Fig. 3 is a similar side elevation showing a six-throw crank shaft with center-bearings. chucked vfor turning the second and fifth crank pins.

Fig. 4 is a side elevation, showing a sixthrow .crank shaft with center bearings, chucked for turning the two inner crank pins.

Fig. 5 is a top plan view of Fig. 4.

Fig. 6 is a side elevation showing a fourthrow crank shaft with one center bearing, chucked for turning the two outer crank pins.

Fig. T is a side elevation showing a fourthrow crank shaft with one center bearing, chucked for turningthe two inner crank pins.

Fig. 8 is a side elevation showing a fourthrow crank shaftwith center hearings.

throw crank shaft with center hearings,

chucked for turning the two inner crank pins.

Fig. 10 is an enlarged transverse section on line 10, 10, Fig. 8.

Fig. 11 is an enlarged transverse section on line 11, 11, Fig. 9.

Fig. 12 is an enlarged transverse sectifn on line 12, 12, Fig. 9.

Fig. 13 is an enlarged transverse section on line 13, 13, Fig. 3.

F ig. 14 is an enlarged transverse on line` 14, 14, Fig. 7.

Fig. 15 is an enlarged plan section on line 15, 15, Fig. 4.

The head-stocks 1 and 2 are of substantially duplicate construction, the left hand head-stock 1 being fixed to the lathe bed 3 sect1 on and the rightI hand head-stock 2 being clamped thereto at desired locations.

The respective head-stock spindles 4, 5, are provided with drive gears 6, 7, meshing with the intermediate gears 8, 9, journaled in brackets l0, 11, depending from each head-stock casing. The gears 8, 9, mesh j taining collars 16 which are secured to the brackets. Both sleeve pinions 12, 13, are splined to a transmission shaft 17 and the shaft is secured within the pinion 12 by a set screw 18, thereby preventing a lateral (see Figs. 10, 11 and 15.).

movement of said shaft. During a lateral adjustment of the right hand head-stock, the

sleeve pinion 13 slides upon the shaft 17. The main drive mechanism may be of any desired type, either direct or through suitable speed change mechanism engaging with the spindle gear 6 of the stationary headstock.

As the type of main drive has no direct bearing upon the present invention, no illustration or description thereof is herein presented. Y

rI-he spindles 4, 5, are provided with 'flanges or chuck plates 20, 21, to which are secured the different chuck devices, as will now be described.

Main chucks.

The body portions of the right and left hand main chucks A and B are of similar designexcepting as to length, one of them being longer than the other to accommodate the long bearing end of a crank shaft to be turned. A second difference is that the chuck A is provided with a groove in its uppersurface for the attachment of devices hereinafter described, it, of course, being obvious that boththe chuck bodies could be of equal lengthl and both provided with said groove if desired.

The body portions of the chucks a-revof hollow barrel formation (see Figs. 12, 13) and each are provided with a fia-nge 22 for securance by 'bolts 23 'to their respective spindle chuck plates 20, 21, of the right and left head-stocks. Each chuck is provided with work engaging mechanism and as' such mechanisms are, in the main, substantially alike, a descriptlon of one of them will suffice herein, except 'as to one detail, to be later described.

The vertical face of the chuck body is provided witha groove or slide-way 25, in-

which is adjustably mounted a centering throw-block 26 rigidly secured in adjusted position by clamp bolts 27 extending through elongated slots in saidthrow-block and screw threaded into the chuck body, Seated in the upper surface of the throw-block 26 is a half bearing bush 28 secured thereto by a screw 29 and pivoted at 30 on the throw-block 26 is a clamp arm 31, having a companion halfand is also provided with a pin 37 to re-. lieve the screw 29 of end thrusts, the extended face of the bush 28 is engaged by the work, the bush acting as an abutment thrust member.

`With the crank shaft bearing clamped on the throw-block 26, said block may be ra`- dially adjusted relative totlul chuck body to bring the center of the ad j are nt crank pin to be turned, to the center of chuck rotation. This is accomplished by the followin means:

rejecting laterally from the chuck body is a boss 40 and between this boss and the lower surface of the throw-block 26 is positioned a spacing sleeve or gauge 41, the three parts being clamped together by a clamp screwl 42 extending through said boss and sleeve and screw threaded into the throwblock. The sleeve 41 corresponds in length to the throw of the crank shaft being turned and is interchangeable with other spacing sleeves of various lengths for definitely determining the adjustments of the throwblock 26 to accommodate crank shafts of different throw dimensions.

The throw-block 26 is provided with a U- shaped laterally projecting flange 43 between the opposing sides of which one of the transverse arms of the chucked crank shaft projects. Screw threaded in the flange 43 at opposite points, we provide a pair of locating clamp screws 44, 45, adapted to en- .gage the opposite sides of the crank shaft arms and adjustable to locate and clamp the crank shaft in position, with the-center of the crank pin to be 'turned. in coincident alignment with the center of the chuck rotaclamping the throw-block 26' firmly against the vertical face of the chuck body. After the throw-block is adjusted for a definite .crank shaft throw the crank shaft is placed 1n osition with a center bearing thereof restlng upon the thrust bush 284 and the adjacent crank 'arm projecting radially beshaft bearing.

. positionin tween the locating clamp screws 44, 45. The clamp arm or strap 31 is swung to position and the clamp nut 35 slightly tightened to frictionally restrain the crank shaft against a f-ree turning movement, if desired. In the adjacent crank pin to be turned coincident with the axis of chuck rotation, the locating screw 45 is adjusted to center said crank pin and a lock nut 46 on said screw is tightened to lock the screw in set position. The clamp screw 44 is then tightened against the oppositeside of the crank arm to rigidly secure the crank' arm in adjusted position after which the clamp nut 35 is fully tightened to clamp the crank To provide for a wide range of throwblock adjustments, we provide an additional pair of tapped holes 47 in the U-shaped flange of said throw-block to accommodate the'locating screws 44, 45, and for the same purpose, we provide an additional pair of tapped holes in the face of the chuck body to accommodate the clamp bolts 27.

In Fig. 2 the six-throw crank shaft with full center bearings is chucked for turning the two outer crank pins a, f, the end bearings 50, 50, being clamped to the throwblocks of the right and left chucks A and B respectively. f

Fig. 3 illustrates the method of chucking sai'd six-throw shaft for turning the second and fifth crank pins b and e. In this case, an additionalv locating device is ena ployed, (see Figs. 3 and 13). A groove or T-slot 55 is formed in the upper surface of i the body of the chuck A and a bracket 56 is adjustably secured therein by a bolt 57 and nut 58. A locating V.-head block 60 having a st-ud end 59 is adjustably mounted in the bracket 56 and is secured in adjusted position by a set screw 61. The locating block 60 is disposed at an angle kof one hundred and twenty degrees (120) from a radial line passing through the axes of theA crank shaft and of chuck rotation and coincides with the an lar disposition of the off.- set crank pins. ith the crank .shaft ositioned, as shown in Fig. 3, the turned crank.

pin 'a is engaged by the V-head locating block 60 to accurately position said crank pin to the required one hundred and twentydegree (120)- angle to b i'ing the crank pin to proper turning position.

Eactemsimi chuck.

When turning the two inner crank pins c and d (see Fig. 4), extension chucks or adapters C and D are employed. These eX- tension chucks extend the reach of the chuck mechanism to clamp the crank arms'adjacent the crank pins to be turned. The

clamping and centering mechanism of the chucks C and D is the same as that of the chucks A and B, as previously described,

the shaft against rocking.

the throw-blocks of the chucks A and B engaging the center bearings 52, 52, and the throw-blocks of the chucks C and D engaging the center bearings 51, 51. Each eXtension4 chuck is secured to the companion mainY chuck by bolts 70. To accurately center the extension chuck upon the main chuck previous to tightening the bolts 70, we provide locating studs 71, 71, which extend through bushed orifices 'in the extension chuck flange and into similar bushed orifices in the body portion of the main chuck. These locating studs are secured in position by set screws crank pins g and j, and second, the crankpins h and z', in these cases only the main chucks A and B being employed. In the crankshaft shown, the crank pins are diametrically opposite, therefore a different locating "block is provided comprising the V- head 75 adjustably clamped on a stud 76 of a bracket 77 by a set screw 7 8, said bracket beingfadjustably clamped in position in the T-slot 55 of Jthe chuck body A by the bolt 79 and 'nut 8.0.

Auxiliary centering chucks.

vFigs. and 7 illustrate a four-throw crank shaft with one center bearing chucked in two turning positions. As shown, two short main chucks are employed, but it is obvious I that if the shaft end were longer, a longer main chuck body, such as chuck A, would be utilized. For the first turning operation of turnin the end crank pins Z2. and @,the shaft .is chuc red the same as previously explained in connection with the six-throw shaft shown in Fig. 2. For chucking the shaft for turning the inner crank pins l and m, we employ auxiliary centering chucks E and F. Chucks E, F, each comprise the body portion 90, which is attached to the adjacent chuck member by bolts 91 and locating studs 92, of the same construction as those used in attaching the chucks C D to the chucks A and B. The outer end of each body portion is of U-forination (see Fig. 14) providing opposing walls in which are screw threaded a pair of locatin bolts 93, 94, each adapted to engage one si e of a crankcarm to clamp The upper surface of the chuck body 90, of the chuck E, is provided with a l'slot 95, -in which is adjustably clamped a bracket 96 supporting. a locating block 97, similr in construction and function to the locating block 75, precrank pin Z coincident with the center of the chuck rotation. If desired, the auxiliary chuck F may also be provided with a locating block to engage the turned crank pin n.

Having described the invention, we claim:

l. A crank-shaft chuck comprising a body attachable to the face plate and constituting an axial elongation of the spindle unsupported at its outer end, work positioning and receiving mechanism on the end face of said body comprising a radially adjustable member, means on said radially adjustable mem ber for circumferentially gripping a. bearing portion of the shaft, a crank shaft throw length gauge sleeve on the body and forming a seat for the radially adjustable member, means passing through said sleeve for radially clamping together said body, gauge and radially adjustalile member, and means on the radially adjustable member for clamping a portion of the work holding it rigid upon t 1e axis of rotation.

2. A chuck for a crank shaft turner comprising a body portion, having one face adapted for securance to a spindle faceplate, and the outer face on the unsupported end of said body having crank shaft securing mechanism, comprising a member radially adjustable on the outer face, and having means for gripping a bearing portion of the crank shaft relative to the axis of rotation, a removable gauge against` which said radially adjustable member seats, determining a definite regulation thereof coincident to the crank shaft throw length, means for radially clamping the adjustable member and removable member to said body portion, means on said radially adjustable member for circumferentially clamping an adjacent crank shaft bearing and a chuck secured upon the outer face of said body portion providing an extension section therefor for supplementarily clamping a crank shaft.

3. A crank-shaft chuck comprising a main chuck body and an extension chuck body removably secured thereto, each chuck body having associated therewith a work-securing mechanism comprising a radially adjustable member clampingly embracing a bearing portion of a crank shaft, a removable gauge defining the degree of radial adjustment coincident to the length of crank shaft throw, and means for clamping the radially adjustable member in adjusted position, a centering device on the main chuck body engaging a crank pin for centering another crank pin coincident to the axis of chuck rotation, and means on the extension chuck body engaging a predetermined portion of the work.

4L. A crank-shaft chuck comprising a main chuck body and an auxiliary chuck body removably secured thereto, a work-securing mechanism carried by the main chuck body, and comprising a. radially adjustable shaft engaging and clamping member, a removable gauge member providing a positive regulation of adjustment of the clamping member coincident to the length of crank shaft throw, means for securing the clamping member in an adjusted position, a centering device adjustable on the auxiliary chuck body and adapted to engage a crank pin to center an adjacent crank pin coincident to the axis of chuck rotation, and means gripping a portion of the work adjacent to the crank pin to be turned.

5. A crank shaft chuck comprising a body attachable to the spindle to constitute an axial elongation thereof unsupported at its outer end, work securing means on the end face of the body comprising a radially adjustable member, a removable gauge block corresponding in length to a predetermined throw of a crank shaft, means for radially clamping together relatively the said chuck body, gauge and radially adjustable memvber, said radially adjustable member com- 6. A crank shaft chuck comprising a body attachableto the spindle to constitute an axial elongation thereof unsupported at its outer end,work securing means on'the end face of the body comprising a radially adjustable member, a removable gauge block corresponding in length to a predetermined throw of a crank shaft, means for radially clamping together relatively theosaid chuck body, gauge and radially adjustable member, said radially adjustable member comprising first, means for laterally clamping an element of the crank shaft, holding it rigidly centered at the axis of rotation, and second, means for circumferentially clamping one of the crank shaft journals adjacent. the centered element, and means attachable a to an intermediate portion of the chuck body for the second operation, adapted to support and position the first turned crank shaft bearing in rear of said circumferential clamping means.

7 A crank shaft chuck comprising a body attachable to the spindle to constitute an axial elongation thereof unsupported at its outer end, work securing means on the end face of the body comprising a radially adjustable member, a removable gauge block corresponding in length to a predetermined throw of a crank shaft, means for radially clamping together relatively the saidchuck body, gauge and radially adjustable member, said radially adjustable member comprising first, means for laterally clamping an eletered element, means attachable to an intermediate portion of the chuck body for the second operation, adapted to support and position the first turned crank shaft bearing in rear of said circumferential clamping` means, a supplemental chuck body for a third operation, substantially a duplicate of the first-named chuck, and means extensibly clamping said second chuck body on the end face of the I'irst chuck body while the crank shaft remains substantially as initially secured, the clamping members on the end face of the second chuck body correspondingly positioning and supporting an intermediate portion of the crank shaft appropriate to the third operation.

8. A. crank shaft chuck attachable to the spindle and constituting an axial elongation thereof, work positioning and supporting members on tl-e unsupported end face of said body comprising, a radially adjustable member, a removable gauge corresponding in length to a predetermined crank shaft throw, means for radially and relatively clamping said body gauge, and adjustable member, said adjustable member comprising rst, means for laterally clamping an element of the crank shaft to hold it rigidly centered at the axis of rotation, second, means for circumferentially clamping an adjacent member of the crank shaft, a supplemental chuck body, and means for extensibly clamping said second body on the end face of the rst chuck while the crank shaft is in position, for chucking another portion ofthe crank shaft.

9. A crank shaft chuck comprising a body attachable to the spindle to constitute an axial elongation thereof unsupported at its outer end, work receiving means on the end face of the body comprising a radially adj ust able member, a removable gauge block corresponding in length to a predetermined throw pf the crank shaft, means for radially clamping together relatively the said chuck body, gauge and radially adjustable member, and a second chuck member removably mounted on the outer end of said body as an extension thereof, having crank shaft clamping and centering devices.

l0. Arcrank shaft chucking and centering device, for a metal turning machine, comprising a body member, having plane faces at its opposite ends for coaxially uniting complementary body members and for mounting the same upon a spindle of aA metal turning machine, and radially adjustable crank shaft clamping means mounted Within one end of said body member.

ln witness whereof, we hereunto subscribe our names, as attested by the two subscribing witnesses.

FRANCIS B. cooKBURN. EwD. s. Bien.

Witnesses: l

JOHN M. Ross, FRANK A. Fm'rzsonr. 

